Allow task pools to reason about transparency.

cc/tiles/tile_manager.h

Index: cc/tiles/tile_manager.h
diff --git a/cc/tiles/tile_manager.h b/cc/tiles/tile_manager.h
index 607d4d66f1b7509d260a2d04a9f3c99bc2669e78..d0ba944b32dea8d618820c4d8877c483d4031948 100644
--- a/cc/tiles/tile_manager.h
+++ b/cc/tiles/tile_manager.h
@@ -154,7 +154,7 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
       TileDrawInfo& draw_info = tiles[i]->draw_info();
       draw_info.resource_ = resource_pool_->AcquireResource(
           tiles[i]->desired_texture_size(),
-          tile_task_runner_->GetResourceFormat());
+          tile_task_runner_->GetResourceFormat(false));
     }
   }
 
@@ -280,6 +280,9 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
   void CheckIfMoreTilesNeedToBePrepared();
   void CheckAndIssueSignals();
 
+  ResourceFormat DetermineResourceFormat(const Tile* tile) const;
+  bool DetermineResourceRequiresSwizzle(const Tile* tile) const;
+
   TileManagerClient* client_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   ResourcePool* resource_pool_;